without the pronounced plane of demarcation between the two qualities of metal, as in the weld of the compound plate. A 10¼-inch nickel steel Harveyized plate, tested at the Indian Head Proving Grounds in 1892, showed a strength which previously had never been equaled in the history of armor, and established beyond question the value of the face-hardening process, which, by various methods, is applied to the nickel-steel plating of to-day. The distribution of armor in the development of battleship construction is shown by the shaded sections on Plates VI and VII, and its relative thicknesses, on various vessels during this progress, by Plate VIII. VII. THE RAM AND THE TORPEDO. For two thousand years the ram—the razor-edged “beak” of the swift galley—was the chief naval weapon. With the advent of sail-power and the employment of gunpowder, it vanished from the seas; but to reappear when the coming of steam gave again controllable propulsion. In 1859 there was built into the French frigate Magenta a sharp spur,—the first modern ram. British construction of the modern era, from the Warrior down, has also recognized this weapon, and it is to-day a factor, although a minor one, in the design of all vessels of high speed. The ram has, however, but a scant record of service in action, while in accidental collision it has wrought more than once appalling disaster. The ironclad Merrimac rammed and sank in Hampton Roads, in March, 1862, the United States sailing sloop-of-war Cumberland, which, under the gallant Morris, went down with guns thundering and ensign flying. On July 20, 1866, during the action off the island of Lissa, in the Adriatic, the Austrian flagship Ferdinand Maximilian rammed the Italian armorclad Re d’ Italia, which, with many of her 800 men, sank with a swiftness that chilled the blood of those who watched. Like this, in its sudden tragedy, was the destruction of the British battleship Victoria by her consort, the Camperdown, off Tripoli, Syria, in the summer sunlight of a June day in 1893. The ram of the latter vessel cut a deep and fatal gash in the Victoria, which within ten minutes turned bottom upward and went down, bow first, bearing with her 321 officers and men, whose unfaltering discipline gave a heroic splendor to their end. Despite these occasional instances of its deadly power, the ram holds a secondary place among naval weapons. To strike a modern vessel at high speed will require more than the skill of the swordsman.